A different audio synch problem - mpeg video wizard

Hi, I have been using MPEG video wizard to edit a number of VOB files in order to compile one complete holiday DVD.

The problem im having is after exporting the files. On viewing the exported files (in powerDVD) the original audio and video are in synch however the additional mp3 music files that I have added appear progressively out of synch.

I have tried some of the guides to synch problems suggesting demuxing and then correcting the timelapse however the demuxed audio file combines both the original audio and the added music so I cant move one independantly of the other.

Is there a solution to this or is there any alternative? I cant seem to find any solutions to this problem and would really appreciate any help!

Thanks

Are your MP3 perhaps VBR? I’ve heard that lot’s of video software can’t handle them.